Defluoridation from aqueous solution by manganese oxide coated graphene oxide
2013; Elsevier BV; Volume: 148; Linguagem: Inglês
10.1016/j.jfluchem.2013.01.028
ISSN1873-3328
AutoresYanhui Li, Qiuju Du, Junjie Wang, Tonghao Liu, Jiankun Sun, Yonghao Wang, Zonghua Wang, Yanzhi Xia, Linhua Xia,
Tópico(s)Adsorption and biosorption for pollutant removal
ResumoA new adsorbent manganese oxide coated graphene oxide (MOGO) was synthesized and characterized by TEM, XRD, FTIR, and BET analysis. The effects of different parameters such as pH, adsorbent dose, contact time and temperature were studied to understand the adsorption behavior of the adsorbent under various conditions. Adsorption studies revealed that optimum removal of fluoride occurred in a pH range of 5.5–6.7. The Langmuir isotherm model demonstrated that the maximum fluoride adsorption capacity of MOGO was 11.93 mg/g and 8.34 times higher than that of GO. The kinetic adsorption data were analyzed using the pseudo first-order model, the pseudo second-order model and the intra-particle diffusion model. Thermodynamic adsorption results showed that adsorption of fluoride by MOGO was a spontaneous and endothermic process.
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